Fix colours for QT JPEG2000, fixes issue 1540.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@20963 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/libopenjpeg.c

@@ -131,7 +131,7 @@ static int libopenjpeg_decode_frame(AVCodecContext *avctx,
                  }
                  break;
         case 4:  has_alpha = 1;
-                 avctx->pix_fmt = PIX_FMT_RGB32;
+                 avctx->pix_fmt = PIX_FMT_RGBA;
                  break;
         default: av_log(avctx, AV_LOG_ERROR, "%d components unsupported.\n", image->numcomps);
                  goto done;